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IXF1104 4-Port Gigabit Ethernet Media Access Controller
194 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
2
Table 119. RX FIFO Low Watermark Port 2 ($0x58C)
Bit Name Description Type
1
Default
Register Description:
The default value of 0x072 represents 114 eight-byte locations. This
equates to 912 bytes of data. A unit entry in this register equates to 8 bytes of data. When the
amount of data stored in the RX FIFO falls below the Low Watermark, flow control is
automatically de-asserted within the MAC to allow more line-side data to be captured by the
RX FIFO.
0x072
31:12 Reserved Reserved RO 0x00000
11: 0
RX FIFO Low
Watermark Port 2
The High Watermark value
NOTE: Should never be greater or equal to the
High Watermark.
R/W 0x072
1. RO = Read Only, No clear on Read; R = Read, Clear on Read; W = Write only; R/W = Read/Write, No
clear; R/W/C = Read/Write, Clear on Write
Table 120. RX FIFO Low Watermark Port 3 ($0x58D)
Bit Name Description Type
1
Default
Register Description:
The default value of 0x072 represents 114 eight-byte locations. This
equates to 912 bytes of data. A unit entry in this register equates to 8 bytes of data. When the
amount of data stored in the RX FIFO falls below the Low watermark, flow control is
automatically de-asserted within the MAC to allow more line-side data to be captured by the
RX FIFO.
0x072
31:12 Reserved Reserved RO 0x00000
11: 0
RX FIFO Low
Watermark Port 3
The High watermark value
NOTE: Should never be greater or equal to the
High Watermark.
R/W 0x072
1. RO = Read Only, No clear on Read; R = Read, Clear on Read; W = Write only; R/W = Read/Write, No
clear; R/W/C = Read/Write, Clear on Write
Table 121. RX FIFO Overflow Frame Drop Counter Ports 0 - 3 ($0x594 – 0x597)
Name Description Address Type
1
Default
RX FIFO Overflow
Frame Drop
Counter on port 0
When RX FIFO on port 0 becomes full or
reset, the number of frames lost/dropped on
this port are shown in this register.
0x594 R 0x00000000
RX FIFO Overflow
Frame Drop
Counter on port 1
When RX FIFO on port 1 becomes full or
reset, the number of frames lost/dropped on
this port are shown in this register.
0x595 R 0x00000000
RX FIFO Overflow
Frame Drop
Counter on port 2
When RX FIFO on port 2 becomes full or
reset, the number of frames lost/dropped on
this port are shown in this register.
0x596 R 0x00000000
RX FIFO Overflow
Frame Drop
Counter on port 3
When RX FIFO on port 3 becomes full or
reset, the number of frames lost/dropped on
this port are shown in this register.
0x597 R 0x00000000
1. RO = Read Only, No clear on Read; R = Read, Clear on Read; W = Write only; R/W = Read/Write, No clear;
R/W/C = Read/Write, Clear on Write